© VALLOX • We reserve the right to make changes without prior notification

• 1.09.347• 3.6.2009• Code 3521© VALLOX

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MODELS:VALLOX 90 SC RVALLOX 90 SC L

Supply and extract air ventilationwith heat recovery

Code 3521

ValloxSC90

1. THREE QUESTIONS ABOUT VENTILATION1.1. Why is air replaced in dwellings?.................................................... p. 31.2. What are the characteristics of adequate ventilation?......................... p. 31.3. How much air is replaced? ............................................................. p. 3

2. INSTRUCTIONS FOR USING VALLOX 90 SC2.1. Initial adjustment .............................................................................. p. 42.2. Selection of fan speed ...................................................................... p. 42.3. Post-heating ..................................................................................... p. 42.4. Heat recovery bypass ....................................................................... p. 52.5. Air filtering ...................................................................................... p. 52.6. Defrosting ........................................................................................ p. 5

3. MAINTENANCE INSTRUCTIONS3.1. Before starting maintenance operations ............................................. p. 63.2. Filters .............................................................................................. p. 63.3. Fans ............................................................................................... p. 73.4. Condensing water ........................................................................... p. 7

4. TROUBLESHOOTING ................................................................................... p. 8

VALLOX 90 SCCONTENTS

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VALLOX 90 SC modelsCode: 3521

ModelsThe letter L or R after the name of the unit indicates the handedness of the unit.

VALLOX 90 SC R• with direct current fansVALLOX 90 SC L• with direct current fans

EVERYDAY QUICK GUIDE

NOTE!Never switch ventilation off,because ventilation keeps indoor airquality uniform and removes gasesand dust emanating from thestructures.

VALLOX 90 SC has been initially adjusted fornormal circumstances in your home. Ventilationadjustment is needed mainly in the followingcircumstances:

• Taking a bath:Boost ventilation in bathing and washingfacilities in order to ensure that the roomsget dry as quickly as possible. It is recom-mended to have boosted ventilation on for2 to 3 hours after taking a sauna bath.

• Washing and drying clothes:Boost ventilation in washing and drying fa-cilities during these activities.

• Sleeping:Ventilation in a bedroom has to be suffi-cient throughout the night. The level is cor-rect when air does not smell fusty whenyou enter the room in the morning.

• Empty dwelling:To save energy, ventilation can be adjustedto the minimum level.

• Cooking:If the ventilation unit is connected to a coo-ker hood, boost ventilation during cooking.

The most common way to abate coo-king fumes is to have a separatecooker hood.

Autumn• Wash or change the coarse filter and clean

or change the fine filter if needed. Therecommendation is approximately once ayear.

• Check that the heat recovery cell is clean.

• Check that the condensing water outlet isnot clogged.

Spring:• Wash or change the coarse filter and clean

or change the fine filter if needed.

• Clean the fan blades and the post-heatingunit if needed.

• Check that summer ventilation is inoperation.

VALLOX 90 SCTHREE QUESTIONS ABOUT VENTILATION

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VALLOX 90 SC,order of duct outlets

1. Supply air to rooms2. Extract air to the unit3. Outdoor air to the unit4. Exhaust air outside

R MODEL1. Supply air to rooms2. Extract air to the unit3. Outdoor air to the unit4. Exhaust air outside

L MODEL

1. THREE QUESTIONS ABOUT VENTILATION1.1. Why is air replaced in dwellings?Good ventilation promotes healthy living for both residents and the building. Air in a dwelling needs tobe replaced in order to remove humidity brought about by living as well as impuritiesemanating from structures and human bodies. Impurities of indoor air include carbondioxide, formaldehyde, radon and other gases as well as dust.

Mechanical ventilation is needed in order to be able to adjust air circulation as needed bythe residents. In a tightly sealed house, air does not circulate sufficiently by natural means.Even in a poorly sealed house air is only replaced because of differences between indoorand outdoor air temperatures, or because of winds. This means that ventilation is dependenton weather conditions and cannot be regulated.

It is especially important that humidity and carbon dioxide content of the indoor air stay at ahealthy level. Recommended humidity content of good indoor air is approximately 45%.Humidity content is lower in winter and higher in summer and autumn. Dust mites thrive inindoor air if humidity exceeds 50%, and if humidity stays at over 60% for a long time inwinter, water condenses in the cold structures of the house and mould starts to form.

The recommended maximum carbon dioxide content in good indoor air is circa 1,000 ppm.

1.2. What are the characteristics of adequate ventilation?• Indoor air stays fresh in all the rooms of the dwelling, also in bedrooms during night.

Without adequate ventilation, carbon dioxide content tends to rise high especially inbedrooms.

• The bathroom and the sauna get dry quickly.• During the heating season, the windows and other outer wall structures remain dry.• Humidity in indoor air is not condensed in the ventilation ducts.• Air is fresh in the toilet as well.

1.3. How much air is replaced?For air to be clean to breathe, it has to be replaced with outdoor air every two hours.

In a new and a renovated house, air needs to be circulated continually, at least once anhour, during the first year in order to remove harmful gases and structural humidity. Inbuildings that are more than a year old and dry, ventilation can be regulated as needed.Ventilation is boosted during for instance a sauna bath, clothes washing and cooking, andreduced during very cold periods or when there is nobody at home. Carbon dioxide andhumidity sensors adjust ventilation in the rooms automatically as needed.

SEASONAL CALENDAR

NOTE!For further details, see inner pages.

1 2 3 44 3 12

VALLOX 90 SC

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INSTRUCTIONS FOR USE

2. Instructions for using VALLOX 90 SCFor indoor air to stay healthy and beneficial also for the structures of the dwelling, ventilationhas to be in operation continually. It is not advisable to stop ventilation even for longerholidays, because it makes indoor air stuffy. Also, during the heating season indoor airhumidity may condense in the ducts and structures and therefore cause humidity damage.

2.2. Selection of fan speedFan speed is selected by using a separate Simple Control speed selector orSlim Line PTXPA SC cooker hood.

2.2.1. Speed selectorThe speed selector can be used to select speeds 1, 2, 3 and 4:1. Use during absence. When the dwelling is empty, ventilation can temporarily be diminished.

2-3. Normal use. In normal conditions air needs to be replaced once in two hours.

4. Boosted operation. Cooking, bathing in the sauna or bathroom, drying clothes, using thetoilet, having guests, overheat or a similar situation may cause a need for higher thannormal ventilation.

If there is a cooker hood independent of the ventilation system in the dwelling, it is notnecessary to raise the speed of VALLOX 90 SC during cooking.

2.3. Post-heatingFor most of the year, heat recovered from the air being extracted is enough to warm the coldair coming from the outside to a suitable temperature. If the heat of extract air is not enough,air coming from the outside may be heated further, as needed, with the heating radiator (K)delivered with the unit. The heating radiator is a PTC resistor, which is a live component.The PTC resistor must not be touched without disconnecting power supply.Supply air temperature is adjusted using thermostat H.

2.1. Initial adjustmentThe ventilation system works properly when air flows in the rooms have been measured andadjusted with the valves in accordance with the planned values. After the initial adjustment, theposition of the ventilation valves must not be changed, with the exception of the outlet valve with aknob located on the ceiling of a sauna, which can be adjusted if needed. The initial adjustmentensures that a sufficient amount of air is circulated and that extract air flow is always greaterthan supply air flow, i.e. the dwelling is negatively pressured compared to outdoor air. Ifthe dwelling is positively pressured, air in the dwelling penetrates the outer envelope of thebuilding and between windows, which may cause humidity damage during the heatingseason.

In normal conditions basic ventilation, with a change of air every two hours, is sufficient in livingareas. Boosting is needed during for example sauna baths, cooking, clothes washing orfamily parties.

Simple Control speed selector

K

H

VALLOX 90 SCINSTRUCTIONS FOR USE

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2.4. Heat recovery bypassIn winter use the heat recovery cell of VALLOX 90 SC recovers heat from the air leavingthe dwelling and uses it to heat the air coming from the outside.In summer use when it is warm outside, it is unnecessary to heat outdoor air. The heatrecovery cell is bypassed in VALLOX 90 SC with the standard damper (A). The positionof the damper can be changed by opening the damper release (B) and then moving thereplacement damper in another position. In the summer position air flow through the cellis prevented, and heat recovery bypass is activated.

2.5. Air filteringVALLOX 90 SC features coarse filtering of both extract and supply air before the fans. Thesupply air side includes a G3 class coarse filter (C) and the extract air side a G3 classcoarse filter (D). The unit can also be equipped with a F7 fine filter (E), which capturesfine dust and pollen as well dust not seen to the eye. The filters need to be in place in theunit whenever ventilation is in operation.

2.6. DefrostingWater condensing from extract air may freeze in the heat recovery cell. Freezing can beprevented by stopping the supply air fan, or the unit can be equipped with a preheatingresistor, which is switched on as needed.

2.6.1. Stopping the supply air fanThe defrost thermostat T1 stops the supply air fan whenever the temperature of extract airis below +5 °C after the cell. The fan restarts when temperature has risen by circa threedegrees, i.e. to 8 °C. The threshold of the thermostat (F) can be adjusted at the back ofthe heat recovery cell. If the unit includes a preheating radiator (G), the supply air fancannot be stopped.

2.6.2. Outdoor preheatingThe unit can have been equipped with a preheating radiator (G) at the factory. If that isthe case, the defrost thermostat T1 switches the preheating radiator on whenever thetemperature of extract air goes below +5°C after the cell. The preheating radiator isswitched off when temperature has risen by circa three degrees to +8°C. The preheatingradiator heats outdoor air before the heat recovery cell and prevents it from freezing. Invery cold temperatures the preheating radiator is not enough to heat maximum air flowto a sufficient degree (in a temperature of minus 30 degrees, maximum air flow is 30dm3/s, which corresponds to speed 2). The limit of the thermostat can be adjusted at theback of the heat recovery cell.

Damper in summer position

Damper in winter position.You can return the winter damperto summer position by pulling thedamper release towards yourself.

Defrost thermostat (F)First remove the heat recovery cell,then the cap protecting the adjustingscrew of the thermostat.

F G

Preheating radiator (G)Preheating radiator is located behind a shield.

AB

CD

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VALLOX 90 SC

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MAINTENANCE INSTRUCTIONS

VALLOX 90 SC filters and heat recovery cell. The unitsare available in right and left handed models. In theright handed model (model R) outdoor air comes tothe unit from the right side of the centre line as shownin the instructions. In the left handed model (modelL) outdoor air comes from the left side of the unit.The filters and the summer / winter damper changeplaces correspondingly.

3. MAINTENANCE INSTRUCTIONS

3.1. Before starting maintenance operationsWhen you open the door of the VALLOX 90 SC unit, the safety switch (T) switches the unitoff; in spite of that, please remove the fuse of the unit from the main fuse panel. If the unitis equipped with a preheating (G) or a post-heating resistor (K), please bear in mind thatthe PTC resistor used as the heating resistor is a live component. Because of this you haveto make sure that the unit has no voltage.

3.2. FiltersWhen the maintenance reminder lights up the control panel indicator, the cleanliness of thefilters must be checked. Outdoor air is filtered in the unit with two kinds of filters. A G3 classcoarse filter (C) filters off insects, heavy pollen and other dust. An F7 class fine filter (E) filtersoff invisible dust. Extract air is filtered with a G3 class coarse filter (D). Clean the coarse filtersD and C by washing them at least twice a year. Wash the filters with +25…30°C warm water andwashing-up liquid, pressing them smoothly. Do not handle the filters with force. Whenwashing is done properly, filters stand cleaning 3 to 4 times. In other words, you have toreplace them at least every two years.The fine filter (E) is not washable. Clean it at the same time as the G3 class filters byvacuuming it with a brush nozzle. When cleaning, be careful no to break filter material.To ensure good supply air quality, replace the filter preferably every year, and at least every two yearsdepending on local air quality. It is recommended to replace filters in autumn. This way thefilters stay cleaner through the winter and can effectively filter off dust in the following spring.In connection with the cleaning of the filters it is also advisable to check the cleanliness ofthe heat recovery (HR) cell (I) at about two-year intervals. The sealing ledge (J) above theHR cell must be torn off before it is possible to start removing the cell. When the sealingledge has been removed, the HR cell can be pulled out of the unit. Note! The laminas of the HRcell are very thin and get easily damaged. The correct way to remove the HR cell is to put yourhands behind the HR cell and slowly pull the cell outward. If the HR cell is dirty, soak it ina solution of water and washing-up liquid. Rinse the HR cell clean with a jet of water. Whenall the water has drained off from between the laminas, you can put the HR cell back inplace. Finally, push the sealing ledge in place.

Detaching of heat recovery elementFirst remove the sealing ledge located abovethe cell. Slowly pull the cell from behind thecell about half way outwards and lift it out ofthe unit.

CD

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J

K

VALLOX 90 SC

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MAINTENANCE INSTRUCTIONS

3.3. FansCheck the cleanliness of the fans in connection with the maintenance ofthe filter and heat recovery cell. Clean the fans if necessary. You canremove the fans from the unit before cleaning them.The fan blades can be cleaned with compressed air or with a brush. Donot remove or move the balancing pieces on the fan blade.

Removing the supply air fan (A)Before removing the supply air filter, you have to remove the F7 fine filter(C) and the shield panel (D) of the preheating radiator. The F7 fine filtercan be removed by pulling, and the protective sleeve of the preheatingradiator is fixed with four screws. The fan is attached to the fixing platewith a butterfly nut. Loosen the butterfly nuts and lift the fan out. Finallydisconnect the quick coupling of the fan conductor.

Removing the extract air fan (B)The fan is attached to the fixing plate with a butterfly nuts. Loosen thebutterfly nuts and lift the fan out. Finally disconnect the quick couplingof the fan conductor.If you use water in cleaning the unit or its parts, do not let it flow intoelectrical devices.

3.4. Condensing waterDuring the heating season, humidity of extract air condenses to water.Water formation may be abundant in new buildings or if ventilation islow compared to the humidity build-up caused by the residents. Condensingwater needs to flow out from the ventilation unit without hindrance. Inconnection with maintenance, e.g. in autumn before the beginning ofthe heating season, make sure that the condensing water outlet (L) in thebottom tank is not clogged. You may check it by pouring a little waterin the tank. Clean if necessary. Do not let water flow to electrical devices.

A

C

B

D

L

L

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VALLOX 90SC

© VALLOX • We reserve the right to make changes without prior notification

1.09

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Vallox Oy • Myllykyläntie 9-11• FI-32200 Loimaa • Tel. +358 10 7732 200 • www.vallox.com

REASON• Air cools down in the attic ducts.• The heat recovery cell is frozen, which is why extract air cannot heat outdoor air.• The preheating radiator does not work.• The extract air filter or cell is clogged.• The initial adjustment of ventilation has not been done.

DO THIS• Measure the temperature of supply air in the unit and compare it with the air coming

from the valve.• Check the insulation of the attic ducts.• Check the operation of the defrost thermostat and preheating resistor (see Section

2.6 Defrosting on page 5). You can turn the defrost thermostat clockwise. In this casethere will probably be no freezing, but extract air can be too warm when going out.The defrost thermostat can also be turned anticlockwise. In this case, the risk offreezing of the heat recovery cell will increase. According to the factory setting, thedefrost thermostat works at +5°C.

• Check that the filters and the heat recovery cell are clean.• Check the initial adjustment.

1. Outdoor air coming to the dwelling is cold.

REASONThe heat recovery cell defrost function works and prevents the cell from freezing.

DO THISIf you want the fan to stop at temperatures lower than the preset value, you can decreasethe threshold value of the thermostat by 1 to 2°C.NOTE!If you decrease the threshold value too much, the cell may freeze.See Section 1.

2. Supply air fan keeps stopping

TROUBLE SHOOTING